EP2113048A1 - Latch assembly - Google Patents
Latch assemblyInfo
- Publication number
- EP2113048A1 EP2113048A1 EP08701996A EP08701996A EP2113048A1 EP 2113048 A1 EP2113048 A1 EP 2113048A1 EP 08701996 A EP08701996 A EP 08701996A EP 08701996 A EP08701996 A EP 08701996A EP 2113048 A1 EP2113048 A1 EP 2113048A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pawl
- pivot pin
- latch
- axis
- eccentric
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000002265 prevention Effects 0.000 claims 2
- 210000000078 claw Anatomy 0.000 description 43
- 230000014759 maintenance of location Effects 0.000 description 20
- 239000000428 dust Substances 0.000 description 10
- 239000000356 contaminant Substances 0.000 description 9
- 230000009471 action Effects 0.000 description 5
- 230000000712 assembly Effects 0.000 description 5
- 238000000429 assembly Methods 0.000 description 5
- 230000009467 reduction Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000003993 interaction Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 238000011109 contamination Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B85/00—Details of vehicle locks not provided for in groups E05B77/00 - E05B83/00
- E05B85/20—Bolts or detents
- E05B85/24—Bolts rotating about an axis
- E05B85/26—Cooperation between bolts and detents
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B85/00—Details of vehicle locks not provided for in groups E05B77/00 - E05B83/00
- E05B85/20—Bolts or detents
- E05B85/24—Bolts rotating about an axis
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B81/00—Power-actuated vehicle locks
- E05B81/12—Power-actuated vehicle locks characterised by the function or purpose of the powered actuators
- E05B81/14—Power-actuated vehicle locks characterised by the function or purpose of the powered actuators operating on bolt detents, e.g. for unlatching the bolt
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B85/00—Details of vehicle locks not provided for in groups E05B77/00 - E05B83/00
- E05B85/20—Bolts or detents
- E05B85/24—Bolts rotating about an axis
- E05B85/243—Bolts rotating about an axis with a bifurcated bolt
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B17/00—Accessories in connection with locks
- E05B17/007—Devices for reducing friction between lock parts
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B77/00—Vehicle locks characterised by special functions or purposes
- E05B77/02—Vehicle locks characterised by special functions or purposes for accident situations
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
- Y10T29/4984—Retaining clearance for motion between assembled parts
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T292/00—Closure fasteners
- Y10T292/08—Bolts
- Y10T292/1043—Swinging
- Y10T292/1075—Operating means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T292/00—Closure fasteners
- Y10T292/08—Bolts
- Y10T292/1043—Swinging
- Y10T292/1075—Operating means
- Y10T292/1077—Cam
Definitions
- the present invention relates to latch assemblies, and in particular latch assemblies for use with car doors and car boots.
- Latch assemblies are known to releasably secure car doors in a closed position. Operation of an inside door handle or an outside door handle would release the latch allowing the door to open. Subsequent closure of the door will automatically relatch the latch.
- Electric actuators are commonly employed in car latches in order to release them.
- Known latches incorporate a rotatable claw which engages with a striker mounted on an opposing surface (for example a car door frame) in order to retain the door in a closed position.
- This rotating claw is often held in position by a pawl, which is also often a rotating component. Release of the claw is thereby achieved by rotating the pawl from an engaged position whereby it engages and retains the claw to a disengaged position whereby the claw is free to rotate. Movement of the pawl is often undertaken by electric actuators. It is desirable to reduce the amount of force required to move the pawl from an engaged position to a disengaged position such that the size of the electric actuator can be reduced thereby reducing
- Simple known latch assemblies include a pawl that is mounted to rotate about a single axis. Such pawls are rotatably mounted on a substantially cylindrical pawl pivot pin inserted into a circular pawl pin orifice in the pawl.
- the pawl pivot pin is fixed to a stationary latch chassis.
- the pawl pivot pin has to be of a certain radius in order to withstand loads that the latch may undergo during normal operation and also during high load impact events.
- a problem with this type of known latch is that the radius of the pawl pivot pin, which as described must be of a certain magnitude to withstand loads, is directly related to the size of the contact area between the pawl and said pawl pivot pin. This is problematic as the amount of friction between these two components is influenced by the amount of dust and contaminants that may accrue between them. Therefore as the contact surface area is increased, the levels of friction inherent within the latch in use is also increased, and a greater actuation force is required to overcome such friction. Therefore larger and more expensive actuators are required which is undesirable.
- GB2409706 shows an example of a low energy release latch 100 (as shown in figure 1) including a first pawl 140 pivotally attached to a toggle link 130, and also to a second pawl 160 configured to retain the toggle link 130.
- a high level of force acts on the first pawl 140 as a result of the vehicle door seal load driving claw 120 in a clockwise direction.
- the seal load acts to collapse the toggle link and pawl arrangement as shown in figure 8 which is prevented in figure 1 by the interaction of the first pawl 140 and a second pawl 160. Release of the latch 100 is therefore achieved by a clockwise rotation of the second pawl 160 which in turn releases the first pawl 140.
- WO/2006/087578 discloses a device (see figure 1) in which the first pawl 16 is mounted on a crankshaft 50. Door seal loads act to rotate the claw 14 in a clockwise direction, which rotation is prevented by pawl 16. Pawl 16 is mounted on a crank shaft 18 and is configured such that force FP acts to generate a clockwise torque on the crankshaft 18 which is rotatationally constrained by release plate 72 acting on release lever 52 (see figure IB). Release by actuation of release plate 72 allows the crankshaft 50 to rotate and the pawl to move under force FP to enable the latch to open.
- crank pin 54 it can be clearly seen in WO/2006/087578 that the radius on which the pawl 16 rotates about crank pin 54 is necessarily large in order to encompass the cylindrical pin 56 (see figure 1C).
- the radius of the crank pin 54 therefore has to be equal to at least the distance between the crank pin axis Y and the crank shaft axis A plus the radius of the cylindrical pin 56 (i.e. the minimum required radius, r m i n ).
- Such a large radius of rotation means that the perimeter of the pivot hole 46 is significant.
- the radius of the pivot hole 46 is in the order of 9 millimetres or more. This is problematic as dust contamination can cause excessive friction between the pawl 16 and the crank shaft 52 increasing the effort required to rotate them relative to each other. This is undesirable as larger actuators are required to rotate the two components relative to each other.
- a torque is applied to eccentric 54 as the line of action of force FP is offset from axis A.
- the size of the lever arm at which this torque is applied is determined by the start angle of eccentric 54 (i.e. in the closed position).
- start angle at start angles of 0 and 180 degrees, the eccentric 54 is at top dead centre (unstable equilibrium) and bottom dead centre (stable equilibrium) respectively.
- start angle at start angles of 0 and 180 degrees, the eccentric 54 is at top dead centre (unstable equilibrium) and bottom dead centre (stable equilibrium) respectively.
- the lever arm increases to a maximum and the maximum torque for a given force FP is applied to the eccentric.
- the lever arm producing the torque on the eccentric 54 decreases.
- the angle is too low (i.e. below a minimum backdrive angle)
- the torque produced by the lever arm and the force FP will be insufficient to overcome the friction in the system, rotate the eccentric 54 and open the latch.
- the start angle must be above the minimum backdrive angle, typically in the order of 54 degrees.
- This minumum backdrive angle is indicative of the friction inherent in the latch assembly and therefore of the torque required to open the latch assembly. If it is reduced, a lower torque is sufficient to open the latch. This is beneficial as less effort is therefore required to release and latch the latch.
- a latch assembly having a chassis, a latch bolt, movably mounted on the chassis and having a closed position for retaining a striker and an open position for releasing the striker, a pawl having an engaged position at which the pawl is engaged with the latch bolt to hold the latch bolt in the closed position and a disengaged position at which the pawl is disengaged from the latch bolt thereby allowing the latch bolt to move to the open position, in which the pawl is rotatably mounted via a pawl pivot pin about a pawl axis, and in which the pawl pivot pin includes a first arcuate portion having a first radius about the pawl axis, and in which the cross-sectional area of the pawl pivot pin, taken perpendicular to the pawl axis, is greater than the area of a circle having the first radius.
- a pawl pivot pin cross sectional area substantially greater than the area of the circle having the radius of the first arcuate portion it is possible to have a first arcuate portion of relatively small radius without compromising the strength of the pawl pivot pin.
- This lower radius of the first arcuate portion means that the detrimental effect of dust and contaminants is reduced as the mating area between the pawl pivot pin and the surface against which it rotates is reduced. This also reduces the minimum backdrive angle compared to known latches.
- the pawl pivot pin is mounted in a pawl pin orifice including a second arcuate portion having a second radius about the pawl axis, substantially similar to the first radius, and in which the cross-sectional area of the pawl pin orifice, taken perpendicular to the pawl axis, is greater than the area of a circle having the second
- the arrangement may use a "live” pivot (i.e. in which the pawl pivot pin is connected to the pawl and the pawl pin orifice is defined in an adjacent component, e.g. the chassis or an eccentric) or a “dead” pivot (in which the pawl pivot pin is connected to a chassis or eccentric and the pawl pin orifice is defined in the pawl.
- a "live" pivot i.e. in which the pawl pivot pin is connected to the pawl and the pawl pin orifice is defined in an adjacent component, e.g. the chassis or an eccentric
- a “dead” pivot in which the pawl pivot pin is connected to a chassis or eccentric and the pawl pin orifice is defined in the pawl.
- a latch assembly having a chassis, a latch bolt, movably mounted on the chassis and having a closed position for retaining a striker and an open position for releasing the striker, a pawl having an engaged position at which the pawl is engaged with the latch bolt to hold the latch bolt in the closed position and a disengaged position at which the pawl is disengaged from the latch bolt thereby allowing the latch bolt to move to the open position, in which the pawl is rotatably mounted via a pawl pivot pin about a pawl axis, and in which the pawl pivot pin is rotatably mounted in a pawl pin orifice including a pawl pin orifice arcuate portion having a second radius about the pawl axis, and in which the cross-sectional area of the pawl pin orifice, taken perpendicular to the pawl axis, is greater than the area of a circle having the second radius.
- the cross sectional area of the pawl pin orifice is made greater than that of a circle having the radius of the second arcuate portion, it is ensured that less than the entire perimeter of the pawl pivot pin is in contact with the pawl pin orifice. Therefore the contact area between the pawl pivot pin and the pawl pin orifice is reduced compared to known arrangements and as such the effect of dust and contaminants is reduced.
- Figure 1 is a backplate side view of certain components of a first embodiment of a latch assembly according to the present invention in a closed position
- Figure IA is a backplate side view of the pawl of figure 1
- Figure IB is a latch plate side view of the pawl of figure 1
- Figure 2 is a backplate side view of the latch of figure 1 in a released position
- Figure 3 A is a backplate side view of the latch of figure 1 in a semi closed position
- Figure 3B is a backplate side view of the latch of figure 1 in a position between the semi closed position of figure 3 A and a first safety position
- Figure 3C is a backplate side view of the latch of figure 1 in a semi closed position between first safety and closed,
- Figure 3D is a backplate side view of the latch of figure 1 in a fully closed position
- Figure 4A is a schematic view of a prior art latch
- Figure 4B is a detailed view of the latch of figure 1,
- Figure 5 is a backplate side view of certain components of a second embodiment of a latch assembly according to the present invention in a closed position
- Figure 6 is a retention plate side view of the latch of figure 5 in a closed position
- Figure 7 A is a retention plate side view of the latch of figure 5 in a released position
- Figure 7B is a backplate side view with the latch of figure 5 in a released position
- Figure 8 is a backplate side view of the latch of figure 5 in an open position
- Figure 9A is a backplate view of the latch of figure 5 in a semi closed position
- Figure 9B is a backplate view of the latch of figure 5 in a first safety position
- Figure 9C is a backplate view of the latch of figure 5 in a semi closed position between first safety and closed,
- Figure 9D is a backplate side view of the latch of figure 5 in a fully closed position
- Figure 10 is a backplate side view of certain components of a third embodiment of a latch assembly according to the present invention
- Figure 11 is a retention plate side view of the latch of figure 10
- Figure 12 is a backplate side view of certain components of a fourth embodiment of a latch according to the present invention in a closed position
- Figure 13 is a backplate side view of the latch of figure 12 in a released position
- Figure 14A is a backplate side view of certain components of a fifth embodiment of a latch according to the present invention in a closed position
- Figure 14B is a retention plate side view of the latch of figure 14A in a closed position
- Figure 14C is an exploded view of certain components of a sixth embodiment of a latch according to the present invention
- Figure 15A is a backplate side view of certain components of a seventh embodiment of a latch assembly according to the present invention in an open position
- Figure 15B is a retention plate side view of the latch of figure 15A in an open position.
- a latch assembly 10 including a latch chassis 12, a latch bolt in the form of a rotating claw 14, a pawl 16 and a pawl pivot pin 18.
- Latch assembly 10 is mounted on a door 8 (only shown in figure 1).
- the major components of the latch chassis 12 are a retention plate 20 and a backplate 23 (only shown partially in figure 1).
- the backplate 23 is mounted on the opposite side of the latch assembly 10 such that views from the backplate side are in the opposite direction to views from the retention plate side of the latch assembly 10.
- Retention plate 20 is generally planar and includes a mouth 22 for receiving a striker 24, generally attached to a door frame (not shown).
- Projecting from the retention plate 22 is a claw pivot pin 26, a pawl pivot pin 28 and a stop pin 30.
- the pawl pivot pin 18 includes a cylindrical body 52 and a lug 54 generally offset from the cylindrical body 52 and including a first arcuate portion 56 of radius A. In this case the pawl pivot pin 18 is non-rotatably fixed to the latch chassis 12.
- the retention plate 20 further includes a mouth 34 for receiving the striker 24. Furthermore, the retention plate 20 further includes threaded holes 36 which in use are used to secure the latch assembly to the door 8.
- the rotating claw 14 is mounted rotatably about the claw pivot pin 26 and includes a mouth 32 for receiving the striker 24.
- the rotating claw 14 further includes a first safety abutment 38 and a closed abutment 40.
- the pawl 16 is generally planar and includes a claw abutment 46 and a chassis abutment 48.
- the pawl 16 further includes a pawl pivot pin orifice 50.
- Pawl pivot pin orifice 50 includes a second arcuate portion 58 of radius B and a third arcuate portion 60 of radius C. Referring to figures IA and IB, these arcuate portions and their radii can be seen in more detail. It will be appreciated that all three arcuate portions have a substantially common origin, that is a pawl axis X about which the pawl 16 rotates. It should also be noted that radius A and radius B are substantially similar such that the pawl 16 can rotate relative to the pawl pivot pin 18 about the pawl axis X.
- actuator 62 connected to an actuator rod 64 which is in turn connected to the pawl 16. Actuation of actuator 62 retracts actuator rod 64 such that the pawl 16 rotates in a clockwise direction against the bias of a spring 66.
- Figure 2 shows the latch assembly 10 in a released position whereby the actuator 62 has rotated the pawl 16 in a clockwise fashion in order to allow claw 14 to rotate in a clockwise fashion about the pawl axis X of the claw pivot pin 26. As can be seen this rotation allows striker 24 to be released from the latch assembly 10 (the position of the pawl 16 in the closed position is shown in dotted line for comparison).
- Pawl 16 returns to a rest position after the closed abutment 40 of the claw has rotated past the claw abutment 46 of the pawl 16.
- the rest position is as shown in the dotted line i.e. it is the same as the closed position.
- the return to the closed position is aided by spring 66.
- actuator 62 could act in a reverse direction in order to allow pawl 16 to return to its rest position.
- FIGs 3 A to 3D show the latch assembly 10 moving from the released state shown in figure 2 to the closed state shown in figures 1 and 3D. Closure of the latch is enabled by movement of the striker 24 relative to the latch assembly 10 from the right to the left when viewing figures 3 A to 3D. This corresponds to a closing of the door.
- the movement of the striker 24 tends to rotate the claw 14 in an anticlockwise direction.
- This in turn rotates the pawl 16 in a clockwise direction from the rest position of figure 2 against the bias of spring 66 until the first safety abutment 38 has passed the claw abutment 46 of the pawl 16.
- the latch assembly 10 In the position shown in figure 3B, the latch assembly 10 is approaching a first safety condition whereby the first safety abutment 38 is about to engage the claw abutment 46.
- the pawl 16 begins again to rotate in a clockwise sense against the bias of spring 66 until the claw reaches a closed position as shown in figure 3D and the bias of spring 66 returns the pawl 16 to its closed position whereby claw abutment 46 is engaged with the closed abutment 40 of the claw 18.
- the chassis abutment 48 of the pawl 16 engages with stop pin 30 such that the pawl 16 cannot rotate any further.
- the latch is now back in the closed condition as shown in figure 1.
- figure 4A shows a schematic view of a method of mounting a pawl 17 to a latch chassis via pawl pivot pin 19 of radius D.
- the radius D of pawl pivot pin 19 needs to be sufficient to withstand the forces transmitted through the latch both in normal use and in high load events, for example vehicle crash events. It will be appreciated that as the radius D is increased, the effective contact area between the pawl pivot pin and a pawl 17 is increased. The resulting increase in contact area between these two components means that a higher amount of dust and contaminants are able to infiltrate the contact area during the service life of the latch resulting in the requirement for a higher force required to rotate pawl 17 in a clockwise sense in order to release the latch. Therefore the actuator 63 has to be of sufficient size to overcome these frictional forces.
- the radius of contact between the pawl pivot pin 18 and the pawl 16 is defined by the radius A of the first arcuate portion 56 of the pawl pivot pin 18.
- the geometry of the pawl pin orifice 50 is such that only a segment of the circle defined by radius A of the first arcuate portion 56 is in contact between the pawl pivot pin 18 and the pawl 16. Therefore the contact area and consequently the effect of the ingress of dust and contaminants is significantly reduced, reducing the load required to rotate the pawl 16 and therefore the size of the actuator 62.
- FIG. 5 shows a second embodiment of a latch assembly 110.
- Latch assembly 110 is similar to latch assembly 10 with common components having reference numerals of latch assembly 10, but 100 greater.
- Latch assembly 110 includes a pawl 116 substantially identical to the pawl 16 of latch assembly 10.
- a pawl pivot pin 168 differs from the pawl pivot pin 18 in that it is rotatably mounted on a latch chassis 112 such that it is able to rotate about pivot axis Y (as mentioned above, the pawl pivot pin 18 is non-rotatably fixed to the latch chassis 12). Referring to figure 6 this rotation is brought about by a cylindrical portion 170 (an extension of a cylindrical body 152) of the pawl pivot pin 168 which passes through a retention plate 120. It will therefore be appreciated that the pawl pivot pin 168 forms an eccentric as the pawl axis X and the pivot axis Y are offset.
- a lever 172 is connected to the cylindrical portion 170 of the pawl pivot pin 168 on a side of the retention plate 120 opposite to the pawl 116.
- Lever 172 is held in position by a. moveable abutment 174 which is configured to be displaced in a downwards direction by an actuator 176.
- the lever 172 is prevented from moving clockwise when viewing figure 6 by a lever abutment 178.
- the latch assembly 110 is in an open condition with a claw 114 rotated such that the striker (not shown) is released.
- the lever 172 has returned to its original position against lever abutment 178.
- the mechanism by which the lever 172 returns to its original position is by way of a reset abutment on the claw (not shown) which rotates the pawl pivot pin back to its original position as shown in figure 5.
- a more detailed explanation of the reset sequence may be found below (with respect to figures 18 and 19).
- FIG. 9A the striker 124 moves to the left and as such rotates the claw 114 in an anticlockwise direction.
- Contact between the first safety abutment 138 and the claw abutment 146 causes the pawl 116 to rotate in a clockwise sense about the pawl axis X.
- the pawl 116 rotates against the bias of the spring 166.
- Figure 9B shows the position wherein the first safety abutment 138 has passed the claw abutment 146 and thus the pawl 116 returns to its reset position with chassis abutment 148 contacting stop pin 130.
- the reduction in friction in the system results in a reduction in the aforementioned minimum backdrive angle.
- the start angle of the latch assembly 101 is indicated at H in figure 5.
- the present invention allows this angle to be reduced to levels significantly lower than known latches (i.e. the minimum backdrive angle is reduced) to levels in the order of 14.4 degrees (compared to known latches with, for example, minimum backdrive angles in the order of 54 degrees).
- the latch 110 is an arrangement in which the force G acts to the left of pivot axis Y in figure 5. Therefore the latch is only held closed by the presence of lever abutment 178 acting on the lever 172. It will be appreciated that the present invention extends to intrinsically stable latches as will be described below.
- a latch assembly 210 is substantially similar to the latch assembly 110 and common features have reference numerals 100 greater.
- the main difference between latch assembly 110 and latch assembly 210 is that a pawl pivot pin orifice 282 and a lug 284 are oriented differently to the pawl pivot pin orifice 150 and the lug 154.
- the latch assembly 210 is configured such that force F acting from a striker 224 produces force G resulting from the interaction between a closed abutment 240 and a claw abutment 246 such that force G acts directly through both the pawl axis X and the pivot axis Y.
- a pawl pivot pin 218 acts as a crank arm at a top dead centre position i.e. in unstable equilibrium.
- an actuator 286 including an actuation member 288 is connected to a lever 272.
- the lever 272 sits against a lever abutment 278 mounted onto a latch retention plate 220.
- the actuator 286 In order to release the latch the actuator 286 is actuated such that the actuator member 288 rotates the lever arm 272 in an anticlockwise direction when viewing figure 11.
- latch assembly 210 exhibits the same beneficial effects of the presence of the lug 284. Generally latch friction is reduced and as such the latch is easier to operate requiring smaller actuators thereby reducing latch size.
- the relative sizes of the pawl pivot pin 18, 168, 218 and the pawl pivot pin orifice 50, 150, 282 can be varied to both permit and limit the relative motion between the pawl pivot pin and the pawl 16, 116, 216.
- the pawl pivot pin 18 contacts the pawl 16 at a contact point 21 distant from the lug 54.
- Contact point 21 is able to slide across the third arcuate portion 60 in order to increase stability of the latch arrangement and prevent excessive relative movement between the pawl pivot pin 18 and the pawl 16.
- Latch assembly 310 operates in substantially the same way as latch assembly 110 and includes a latch chassis 312 onto which are mounted a claw 314 rotating about a claw pin 316, a toggle member 318 rotating about a toggle pin 320 and a pawl 322 rotatable about a pawl pivot pin 324 mounted on toggle member 318.
- the toggle 318 includes a toggle abutment 326 which engages a moveable abutment 328 mounted onto the latch chassis 312 via an actuator 330 to rotate about an abutment axis Z.
- the pawl 332 and the toggle 318 are biased into the position shown in figure 12 via spring 332.
- the pawl pivot pin is rotatable in a pawl pin orifice which is often circular and of a diameter similar to the pawl pivot pin.
- a pawl pin orifice 334 in the shape of an obround with opposing end semi circle portions 336 of diameter substantially equal to the diameter of the pawl pivot pin 324.
- the pawl pin orifice 334 further includes a neck 338 of a width of substantially less than the diameter of the pawl pivot pin 324.
- the contact area between the pawl pivot pin 324 and the pawl pin orifice 334 is substantially less than if the pawl pin orifice was circular. As such the frictional effect of dust and contaminants in this rotational joint is substantially reduced and effort required to open and close the latch is also reduced.
- the pawl includes a pawl pin orifice in which the pawl pivot pin rotates relative to the pawl.
- the pawl pin orifice is defined in the pawl.
- the present invention also extends to live pivot arrangements; i.e. where the pawl pivot pin is fixably mounted to, or integral with, the pawl so it cannot rotate or otherwise move relative to the pawl.
- the pawl pin orifice is therefore defined in the component on which the pawl is rotatably mounted (e.g. the latch chassis, eccentric or toggle).
- the latch assembly 410 as seen in figures 14A and 14B utilises a live pivot arrangement. Components are substantially similar to latch assembly 10, 400 greater, with the exception of the retention plate 420 and pawl 416.
- the pawl 416 is integral with a pawl pivot pin 468 protruding from the retention plate side thereof (as may be seen in figure 14B).
- the retention plate 412 includes a pawl pin orifice 482 similar in shape to the pawl pin orifice 50, although defined on the retention plate 412 and with the second arcuate portion facing in the opposite direction to second arcuate portion 58.
- the latch assembly 410 operates in substantially the same way as latch assembly 10, with the exception that the pawl pivot pin 468 rotates relative to the latch retention plate 420, and remains stationary relative to the pawl 416.
- the latch subassembly 500 as seen in figure 14C also utilises a live pivot arrangement.
- a pawl 502 defines a pawl pivot pin 504 which is inserted into a pawl pin orifice 506 defined in an eccentric 508 such that the pawl rotates about a pawl axis X.
- the eccentric 508 is rotationally mounted to a chassis 510 via the interaction of an eccentric pin 512 and an eccentric pin orifice 514 defined in the chassis. As such, the eccentric rotates about a pivot axis Y.
- This arrangement could be used instead of the dead pivot arrangement shown in latch assembly 110 for example.
- FIG. 15A and 15B An example reset mechanism is shown in figures 15A and 15B with respect to the latch assembly 1110, which is substantially similar to the latch assembly 110 with reference numerals 1000 greater.
- latch assembly 1110 is provided with a reset pin 1500 defined on the claw 1114, and a reset lever 1502 mounted fast to the pawl pivot pin 1168 such that it rotates about the pivot axis Y with the pawl pivot pin 1168.
- a reset abutment 1504 is defined on the reset lever 1502.
- the claw 1114 upon opening once the claw 1114 has rotated clockwise with the first safety abutment 1138 passing the pawl 1116, the claw is then free to rotate to the fully open position as shown in figure 15 A.
- the reset pin 1500 engages and then moves reset abutment 1504 of reset lever 1502.
- This rotates the pawl pivot pin 1168 from the position shown in figure 7B (with respect to pawl pivot pin 168) to the position shown in figure 15 A, thereby resetting the pawl axis X to the equivalent position (with respect to pawl pivot pin 168) as shown in figure 8.
- the release lever 1172 is returned to the position shown in hidden line, abutting the moveable abutment 1174.
- the latch assembly is now reset.
- pawl pin orifice may be defined in either or both of the retention plate and backplate, and for optimum strength will be defined in both.
- the pawl pin orifice could be formed in an eccentric with the pawl pivot pin (integral with the pawl) rotatably mounted therein.
Landscapes
- Lock And Its Accessories (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB0703597.5A GB0703597D0 (en) | 2007-02-23 | 2007-02-23 | Latch assembley |
PCT/GB2008/000328 WO2008102097A1 (en) | 2007-02-23 | 2008-01-31 | Latch assembly |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2113048A1 true EP2113048A1 (en) | 2009-11-04 |
EP2113048B1 EP2113048B1 (en) | 2017-03-15 |
Family
ID=37945654
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08701996.4A Not-in-force EP2113048B1 (en) | 2007-02-23 | 2008-01-31 | Latch assembly |
Country Status (7)
Country | Link |
---|---|
US (2) | US9279277B2 (en) |
EP (1) | EP2113048B1 (en) |
JP (1) | JP2010519436A (en) |
KR (1) | KR20090115808A (en) |
CN (1) | CN201526205U (en) |
GB (1) | GB0703597D0 (en) |
WO (1) | WO2008102097A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020187358A1 (en) * | 2019-03-21 | 2020-09-24 | Kiekert Ag | Door lock, in particular motor vehicle door lock |
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JP2008530407A (en) * | 2005-02-18 | 2008-08-07 | メリター・テクノロジー・インコーポレーテッド | Latch assembly |
GB0703597D0 (en) | 2007-02-23 | 2007-04-04 | Meritor Technology Inc | Latch assembley |
JP4935612B2 (en) * | 2007-10-09 | 2012-05-23 | アイシン精機株式会社 | Vehicle door latch device |
FR2940342A1 (en) * | 2008-12-18 | 2010-06-25 | Valeo Securite Habitacle | Lock for e.g. opening frame of vehicle, has pin whose one section comprises rectilinear portion that is arranged perpendicular to main direction of effort exerted on lock corresponding to effort tending to open frame |
US8235428B2 (en) * | 2009-07-14 | 2012-08-07 | Kiekert Ag | Lock unit having a slotted pawl |
GB2480490B (en) * | 2010-05-21 | 2016-06-08 | Inteva Products Usa Llc | Latch assembly |
GB2480860B (en) | 2010-06-04 | 2014-05-21 | Body Systems Usa Llc | Latch assembly |
US9890562B2 (en) * | 2012-03-20 | 2018-02-13 | Piotr Leonard Kowalczyk | Locking arrangement |
DE102012023261A1 (en) * | 2012-11-29 | 2014-06-05 | Kiekert Aktiengesellschaft | Motor vehicle lock |
JP6222937B2 (en) * | 2013-02-20 | 2017-11-01 | シロキ工業株式会社 | Locking device |
US9657409B2 (en) | 2013-05-02 | 2017-05-23 | Melior Innovations, Inc. | High purity SiOC and SiC, methods compositions and applications |
US10322936B2 (en) | 2013-05-02 | 2019-06-18 | Pallidus, Inc. | High purity polysilocarb materials, applications and processes |
US9919972B2 (en) | 2013-05-02 | 2018-03-20 | Melior Innovations, Inc. | Pressed and self sintered polymer derived SiC materials, applications and devices |
US11091370B2 (en) | 2013-05-02 | 2021-08-17 | Pallidus, Inc. | Polysilocarb based silicon carbide materials, applications and devices |
DE102013109051A1 (en) * | 2013-08-21 | 2015-02-26 | Kiekert Aktiengesellschaft | Motor vehicle door lock |
GB2518142B (en) * | 2013-08-22 | 2017-06-28 | Inteva Products Llc | Energy dampening arrangement for vehicle latch assembly |
KR101434980B1 (en) * | 2013-10-08 | 2014-08-27 | 평화정공(주) | Latch apparatus |
DE102013022059A1 (en) * | 2013-12-23 | 2015-06-25 | Kiekert Aktiengesellschaft | Closing device for a motor vehicle hood and method |
DE102014001160A1 (en) | 2014-01-31 | 2015-08-06 | Kiekert Aktiengesellschaft | Electric motor vehicle door lock with increased reliability |
DE102014201799A1 (en) * | 2014-01-31 | 2015-08-06 | Kiekert Ag | Closing device for a motor vehicle hood and method |
DE102014107390A1 (en) * | 2014-05-26 | 2015-11-26 | BROSE SCHLIEßSYSTEME GMBH & CO. KG | Motor vehicle lock |
FR3026424A1 (en) * | 2014-09-30 | 2016-04-01 | Inteva Products Llc | |
GB2532969A (en) * | 2014-12-01 | 2016-06-08 | Edo Mbm Tech Ltd | Small store suspension and release unit |
KR101673705B1 (en) * | 2014-12-02 | 2016-11-07 | 현대자동차주식회사 | Door latch device for vehicle |
DE102017209376A1 (en) * | 2016-06-07 | 2017-12-07 | Magna Closures Inc. | Vehicle lock latch assembly with double pawl latch mechanism |
CN109561941A (en) | 2016-07-11 | 2019-04-02 | 柯惠Lp公司 | Using the method and apparatus for calculating the transponder tagged objects used during clinical procedure of the cask flask with antenna |
DE102016123659A1 (en) | 2016-12-07 | 2018-06-07 | Kiekert Ag | Motor vehicle door lock |
DE102017102585A1 (en) * | 2017-02-09 | 2018-08-09 | Kiekert Ag | MOTOR VEHICLE LOCK |
DE102017104152A1 (en) | 2017-02-28 | 2018-08-30 | Kiekert Ag | MOTOR VEHICLE LOCK |
CN110130753B (en) | 2018-02-08 | 2022-03-15 | 麦格纳覆盖件有限公司 | Closure latch assembly with latch mechanism having roller pawl assembly |
WO2023172238A1 (en) * | 2022-03-07 | 2023-09-14 | The Eastern Company | Latch apparatus |
FR3102498B1 (en) * | 2019-10-29 | 2021-12-10 | U Shin France | Motor vehicle door lock |
DE102021119651A1 (en) * | 2021-07-28 | 2023-02-02 | Kiekert Aktiengesellschaft | motor vehicle lock |
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JP2008530407A (en) | 2005-02-18 | 2008-08-07 | メリター・テクノロジー・インコーポレーテッド | Latch assembly |
GB2446804B (en) * | 2007-02-23 | 2011-07-13 | Meritor Technology Inc | Latch Mechanism |
GB0703597D0 (en) | 2007-02-23 | 2007-04-04 | Meritor Technology Inc | Latch assembley |
GB2453514A (en) * | 2007-06-08 | 2009-04-15 | Meritor Technology Inc | Latch with lock link and first and second control members |
US8235428B2 (en) * | 2009-07-14 | 2012-08-07 | Kiekert Ag | Lock unit having a slotted pawl |
-
2007
- 2007-02-23 GB GBGB0703597.5A patent/GB0703597D0/en not_active Ceased
-
2008
- 2008-01-31 US US12/528,171 patent/US9279277B2/en not_active Expired - Fee Related
- 2008-01-31 JP JP2009550319A patent/JP2010519436A/en active Pending
- 2008-01-31 KR KR1020097019769A patent/KR20090115808A/en not_active Application Discontinuation
- 2008-01-31 EP EP08701996.4A patent/EP2113048B1/en not_active Not-in-force
- 2008-01-31 WO PCT/GB2008/000328 patent/WO2008102097A1/en active Application Filing
- 2008-01-31 CN CN2008900000279U patent/CN201526205U/en not_active Expired - Lifetime
-
2015
- 2015-04-03 US US14/677,976 patent/US10113342B2/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2008102097A1 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020187358A1 (en) * | 2019-03-21 | 2020-09-24 | Kiekert Ag | Door lock, in particular motor vehicle door lock |
US12006743B2 (en) | 2019-03-21 | 2024-06-11 | Kiekert Ag | Door lock, in particular motor vehicle door lock |
Also Published As
Publication number | Publication date |
---|---|
US10113342B2 (en) | 2018-10-30 |
US20110260475A1 (en) | 2011-10-27 |
WO2008102097A1 (en) | 2008-08-28 |
KR20090115808A (en) | 2009-11-06 |
CN201526205U (en) | 2010-07-14 |
JP2010519436A (en) | 2010-06-03 |
US20150259954A1 (en) | 2015-09-17 |
EP2113048B1 (en) | 2017-03-15 |
GB0703597D0 (en) | 2007-04-04 |
WO2008102097A8 (en) | 2009-10-22 |
US9279277B2 (en) | 2016-03-08 |
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